Content for  TS 29.515  Word version:  18.4.0

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1  Scopep. 6

The present document specifies the stage 3 protocol and data model for the Ngmlc Service Based Interface. It provides stage 3 protocol definitions and message flows, and specifies the API for each service offered by the GMLCc.
The 5G System stage 2 architecture and procedures are specified in TS 23.501 and TS 23.502.
The Technical Realization of the Service Based Architecture and the Principles and Guidelines for Services Definition are specified in TS 29.500 and TS 29.501.

2  Referencesp. 6

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 23.501: "System Architecture for the 5G System; Stage 2".
TS 23.502: "Procedures for the 5G System; Stage 2".
TS 23.273: "5G System Location Services (LCS)".
TS 29.500: "5G System; Technical Realization of Service Based Architecture; Stage 3".
TS 29.501: "5G System; Principles and Guidelines for Services Definition; Stage 3".
OpenAPI Initiative, "OpenAPI Specification Version 3.0.0",
RFC 9113:  "HTTP/2".
RFC 8259:  "The JavaScript Object Notation (JSON) Data Interchange Format".
RFC 9457:  "Problem Details for HTTP APIs".
TS 29.571: "5G System; Common Data Types for Service Based Interfaces; Stage 3".
TS 29.572: "5G System; Location Management Services; Stage 3".
ITU Recommendation E.164: "The international public telecommunication numbering plan".
TS 29.503: "5G System; Unified Data Management Services; Stage 3".
TS 33.501: "Security architecture and procedures for 5G system".
RFC 6749:  "The OAuth 2.0 Authorization Framework".
TS 29.510: "Network Function Repository Services; Stage 3".
TS 22.071: "Location Services (LCS); Service description; Stage 1".
TR 21.900: "Technical Specification Group working methods".
TS 29.518: "5G System; Access and Mobility Management Services; Stage 3".
TS 29.002: "Mobile Application Part (MAP) specification".
TS 33.256: "Security aspects of Uncrewed Aerial Systems (UAS)".
TS 37.355: "Technical Specification Group Radio Access Network; LTE Positioning Protocol (LPP)".
TS 29.122: "T8 reference point for Northbound APIs".

3  Definitions of terms, symbols and abbreviationsp. 7

3.1  Termsp. 7

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2  Symbolsp. 7


3.3  Abbreviationsp. 7

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
5G Core Network
Access and Mobility Management Function
Geographical Area Description
Gateway Mobile Location Centre
Generic Public Subscription Identifier
Location Services
Location Deferred Request
Low Power and High Accuracy Positioning
Mobile Originated Location Request
Mobile Terminated Location Request
Network Exposure Function
Network Induced Location Request
Network Repository Function
Subscription Permanent Identifier

4  Overviewp. 7

The Gateway Mobile Location Centre (GMLC) is the network entity in the 5G Core Network (5GC) supporting Location Services (LCS). Within the 5GC, the GMLC offers services to the AMF, GMLC, NEF, NWDAF and LMF via the Ngmlc service based interface (see TS 23.501, TS 23.502 and TS 23.273).
Figure 4-1 provides the reference model (in service based interface representation and in reference point representation), with focus on the GMLC:
Reproduction of 3GPP TS 29.515, Fig. 4-1: Reference model - GMLC
The functionalities supported by the GMLC are listed in clause 4.3.3 of TS 23.273.

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